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Summary of Significant Accounting Policies Narratives (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Land and Land Improvements         $ 16,000,000.0
Operating Lease, Weighted Average Discount Rate, Percent 5.20% 5.20%      
Operating right-of-use assets, net (1) $ 32,949,000 $ 32,949,000 $ 35,300,000 $ 0  
Ground lease deferred rent payable 0 0 3,500,000 3,510,000  
Other identified intangible assets, net 51,832,000 51,832,000 767,000 55,469,000  
Prepaid expenses $ 9,190,000 $ 9,190,000 $ 140,000 $ 6,482,000  
Finance Lease, Weighted Average Discount Rate, Percent 5.80% 5.80%      
Operating Lease, Weighted Average Remaining Lease Term 20 years 4 months 24 days 20 years 4 months 24 days      
Finance Lease, Weighted Average Remaining Lease Term 7 years 6 months 7 years 6 months      
Fixed Operating and Finance Lease, Cost $ 565,000 $ 1,200,000      
Variable operating lease costs $ 436,000 $ 910,000